Abstract
Signaling through gap junctions (electrical synapses) is important in the development of the mammalian central nervous system. Abundant between neurons during postnatal development, gap junction coupling subsequently decreases and remains low in the adult, confined to specific subsets of neurons. Here we report that developmental uncoupling of gap junctions in the rat hypothalamus in vivo and in vitro is associated with a decrease in connexin 36 (Cx36) protein expression. Both developmental gap junction uncoupling and Cx36 downregulation are prevented by the blockade of NMDA glutamate receptors, action potentials and the calcium–cyclic AMP response element binding protein (CREB), and are accelerated by CREB overexpression. Developmental gap junction uncoupling and Cx36 downregulation are not affected by blockade of non-NMDA glutamate receptors, and do not occur in hypothalamic neurons from NMDA receptor subunit 1 (NMDAR1) knockout mice. These results demonstrate that NMDA receptor activity contributes to the developmental uncoupling of gap junctions via CREB-dependent downregulation of Cx36.
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Acknowledgements
We are grateful to J. Denisova, E. Leininger, I.R. Popescu and T. Stuart for technical contributions and to R.L. Neve (Harvard Medical School) for supplying CREB viral vectors. This research was supported by a Louisiana Board of Regents Research Competitiveness Subprogram award to R.A.C.; and by a US National Institutes of Health grant (RO1 DA015088-01A1), a National Science Foundation grant (IBN-0117603) and an American Heart Association grant (0350530N) to A.B.B.
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Supplementary information
Supplementary Fig. 1
Initial developmental increase in gap junction coupling and Cx36 expression in the hypothalamus in vivo and in vitro. (PDF 347 kb)
Supplementary Fig. 2
Effects of NMDA on cytoplasmic Ca2+ activity in hypothalamic cultures obtained from wild–type and NMDAR1 knockout mice. (PDF 227 kb)
Supplementary Fig. 3
Transient developmental increase in gap junction coupling and Cx36 expression are mediated by action potential–dependent mechanisms. (PDF 117 kb)
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Arumugam, H., Liu, X., Colombo, P. et al. NMDA receptors regulate developmental gap junction uncoupling via CREB signaling. Nat Neurosci 8, 1720–1726 (2005). https://doi.org/10.1038/nn1588
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DOI: https://doi.org/10.1038/nn1588
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